Shared hosting is probably the most commonly-used form of web hosting. In a shared hosting environment, many customers share the resources of a single machine. But while this is more affordable because the cost of that machine is spread across many users, this doesn't mean they're the best choice for all hosting scenarios.
First, let us define what is meant by "dedicated server." dedicated servers are the opposite of a shared server - only one user controls them. Meaning that 100% of the server's resources "belong" to that customer. This gives dedicated hosting some important advantages over shared hosting.
Dedicated servers have better reliability than shared hosting. This is because there is just one client on the server. Often in a shared hosting environment, the errors of one client can require the operator to reboot the machine - affecting the websites of everyone else hosted on that machine this doesn't happen on a dedicated server.
Shared hosting is less secure than dedicated servers. This is because a shared server is nearly always used by multiple independent users at once. Shared servers often are plagued with security breaches that come from one user, but affect all the users on that particular machine.
Dedicated hosting provides better performance than shared hosting. This is because all of the dedicated server's resources can be used to service the website(s) hosted on it. But on a shared server the server's resources must be spread among the users using it, and some resources are wasted.
On a shared server, the server has to be configured for the lowest common denominator. Dedicated servers, however, can be tailored to the needs of just one client. With greater flexibility, dedicated servers can be set for specific situations, leading to greater security, reliability and performance
Although shared hosting may be cheaper there are lots of other factors to consider when deciding on web hosting.
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